I am getting right jaw pain during tb treatment. what could be causing this?

Jaw pain.: It is unlikely from the drugs. Are you also on a biphophonate? Tb can sometimes get into the bone. Tell your docs to check this. It is probably a conincidence.

Stress, clenching?: It is stressful to have a new medical diagnosis. It is more stressful to undergo medical treatments. It is stressful for the outcome to be uncertain. It is very common during times like this for people to clench their teeth. Many do it unknowingly, sometimes asleep, sometimes awake. See a TMJ dentist right away for some easy relief.

Unrelated: Jaw pain likely unrelated to TB and TB treatment. Have an evaluation by an oral surgeon to check your jaw.